I have a rx65 pro that I purchased back in 09/2007 running firmware v6.3. I just got escort live for it, and I love the idea. The problem is that it needs a firmware update, but my serial number got ripped off from my previous mount (Velcro). I opened it up and was able to identify that it has an M4 horn, with a sticker on the inside that says "inspected 08/2007". Does anyone have a guess as to what the first 2 digits of the serial # would be? I need this for updating the firmware through escort live. Thanks in advance for the support. This thing has been a life saver in all of my cars (2005 Supercharged corvette, 2000 WRX, 2006 BMW 330XI). WELL worth its weight in gold.